“solr.data.dir” can only config a single directory

[zhenyuan wei]

Hi all,
     I found the  “solr.data.dir” can only config a single directory.  I
think it is necessary to be config  multi dirs，such as
”solr.data.dir:/mnt/disk1,/mnt/disk2,/mnt/disk3" ， due to one disk overload
or capacity limitation.  Any reason to support why not do so？


Best,
TinsWzy